text: /*
   * Copyright (C) 2008 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <string.h>
  #include <signal.h>
  #include <errno.h>
  #include <fcntl.h>
  
  #include <sys/socket.h>
  #include <sys/select.h>
  #include <sys/time.h>
  #include <sys/types.h>
  #include <sys/un.h>
  
  #include <cutils/sockets.h>
  #include <private/android_filesystem_config.h>
  
  static void usage(char *progname);
  static int do_monitor(int sock, int stop_after_cmd);
  static int do_cmd(int sock, int argc, char **argv);
  
  int main(int argc, char **argv) {
      int sock;
  
      if (argc < 2)
          usage(argv[0]);
  
      if ((sock = socket_local_client("netd",
                                       ANDROID_SOCKET_NAMESPACE_RESERVED,
                                       SOCK_STREAM)) < 0) {
          fprintf(stderr, "Error connecting (%s)\n", strerror(errno));
          exit(4);
      }
  
      if (!strcmp(argv[1], "monitor"))
          exit(do_monitor(sock, 0));
      exit(do_cmd(sock, argc, argv));
  }
  
  static int do_cmd(int sock, int argc, char **argv) {
      char final_cmd[255] = { '\0' };
      int i;
  
      for (i = 1; i < argc; i++) {
          char *cmp;
  
          if (!index(argv[i], ' '))
              asprintf(&cmp, "%s%s", argv[i], (i == (argc -1)) ? "" : " ");
          else
              asprintf(&cmp, "\"%s\"%s", argv[i], (i == (argc -1)) ? "" : " ");
  
          strcat(final_cmd, cmp);
          free(cmp);
      }
  
      if (write(sock, final_cmd, strlen(final_cmd) + 1) < 0) {
          perror("write");
          return errno;
      }
  
      return do_monitor(sock, 1);
  }
  
  static int do_monitor(int sock, int stop_after_cmd) {
      char *buffer = malloc(4096);
  
      if (!stop_after_cmd)
          printf("[Connected to Netd]\n");
  
      while(1) {
          fd_set read_fds;
          struct timeval to;
          int rc = 0;
  
          to.tv_sec = 10;
          to.tv_usec = 0;
  
          FD_ZERO(&read_fds);
          FD_SET(sock, &read_fds);
  
          if ((rc = select(sock +1, &read_fds, NULL, NULL, &to)) < 0) {
              fprintf(stderr, "Error in select (%s)\n", strerror(errno));
              free(buffer);
              return errno;
          } else if (!rc) {
              continue;
              fprintf(stderr, "[TIMEOUT]\n");
              return ETIMEDOUT;
          } else if (FD_ISSET(sock, &read_fds)) {
              memset(buffer, 0, 4096);
              if ((rc = read(sock, buffer, 4096)) <= 0) {
                  if (rc == 0)
                      fprintf(stderr, "Lost connection to Netd - did it crash?\n");
                  else
                      fprintf(stderr, "Error reading data (%s)\n", strerror(errno));
                  free(buffer);
                  if (rc == 0)
                      return ECONNRESET;
                  return errno;
              }
              
              int offset = 0;
              int i = 0;
  
              for (i = 0; i < rc; i++) {
                  if (buffer[i] == '\0') {
                      int code;
                      char tmp[4];
  
                      strncpy(tmp, buffer + offset, 3);
                      tmp[3] = '\0';
                      code = atoi(tmp);
  
                      printf("%s\n", buffer + offset);
                      if (stop_after_cmd) {
                          if (code >= 200 && code < 600)
                              return 0;
                      }
                      offset = i + 1;
                  }
              }
          }
      }
      free(buffer);
      return 0;
  }
  
  static void usage(char *progname) {
      fprintf(stderr, "Usage: %s <monitor>|<cmd> [arg1] [arg2...]\n", progname);
      exit(1);
  }
  
  